{
  "resourceType": "StructureDefinition",
  "url": "https://fhir.nhs.uk/StructureDefinition/NHSDigital-Identifier",
  "name": "NHSDigitalIdentifier",
  "status": "draft",
  "fhirVersion": "4.0.1",
  "kind": "complex-type",
  "abstract": false,
  "type": "Identifier",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Identifier",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Identifier.type",
        "path": "Identifier.type",
        "binding": {
          "strength": "required",
          "valueSet": "https://fhir.nhs.uk/ValueSet/NHSDigital-IdentifierType"
        }
      }
    ]
  }
}